All the tests in tests/ are part of Wget2 the binary, not libwget. Fix
the license and copyright information accordingly.
* tests/libtest.c: libwget -> Wget. LGPLv3+ -> GPLv3+
* tests/test--accept.c: Same
* tests/test--filter-mime-type.c: Same
* tests/test--follow-tags.c: Same
* tests/test--https-enforce-hard1.c: Same
* tests/test--https-enforce-hard2.c: Same
* tests/test--https-enforce-hard3.c: Same
* tests/test--https-enforce-soft1.c: Same
* tests/test--https-enforce-soft2.c: Same
* tests/test--https-enforce-soft3.c: Same
* tests/test--page-requisites.c: Same
* tests/test--post-file.c: Same
* tests/test--save-content-on.c: Same
* tests/test--spider-r.c: Same
* tests/test-E-k.c: Same
* tests/test-auth-basic.c: Same
* tests/test-auth-digest.c: Same
* tests/test-bad-chunk.c: Same
* tests/test-base.c: Same
* tests/test-c-r.c: Same
* tests/test-chunked.c: Same
* tests/test-compression.c: Same
* tests/test-cut-dirs.c: Same
* tests/test-cut-get-vars.c: Same
* tests/test-directory-clash.c: Same
* tests/test-ftp.c: Same
* tests/test-ftps.c: Same
* tests/test-gpg-bad.c: Same
* tests/test-gpg-invalid.c: Same
* tests/test-gpg-missing.c: Same
* tests/test-gpg-save-failed.c: Same
* tests/test-gpg-styles.c: Same
* tests/test-gpg-valid.c: Same
* tests/test-gpg-verify-no-file.c: Same
* tests/test-gzip.c: Same
* tests/test-i-http.c: Same
* tests/test-i-https.c: Same
* tests/test-idn-cmd.c: Same
* tests/test-idn-meta.c: Same
* tests/test-idn-robots.c: Same
* tests/test-include-and-exclude-directories.c: Same
* tests/test-iri-disabled.c: Same
* tests/test-iri-forced-remote.c: Same
* tests/test-iri-list.c: Same
* tests/test-iri-percent.c: Same
* tests/test-iri-subdir.c: Same
* tests/test-iri.c: Same
* tests/test-k.c: Same
* tests/test-limit-rate-http2.c: Same
* tests/test-limit-rate.c: Same
* tests/test-meta-robots.c: Same
* tests/test-metalink.c: Same
* tests/test-np.c: Same
* tests/test-ocsp-server.c: Same
* tests/test-ocsp-stap.c: Same
* tests/test-p-nc.c: Same
* tests/test-parse-css.c: Same
* tests/test-parse-html-css.c: Same
* tests/test-parse-rss.c: Same
* tests/test-plugin-dummy.c: Same
* tests/test-plugin-failure.c: Same
* tests/test-plugin-interception.c: Same
* tests/test-plugin-nonexistance.c: Same
* tests/test-plugin.c: Same
* tests/test-post-handhshake-auth.c: Same
* tests/test-redirection.c: Same
* tests/test-restrict-ascii.c: Same
* tests/test-robots.c: Same
* tests/test-stats-dns.c: Same
* tests/test-stats-ocsp.c: Same
* tests/test-stats-server.c: Same
* tests/test-stats-site.c: Same
* tests/test-stats-tls.c: Same
* tests/test-timestamping.c: Same
* tests/test-unlink.c: Same
* tests/test-wget-1.c: Same
* cfg.mk: Multiple changes.
(sc_GPL_version): Don't exclude all files when only one has a parsing
issue
(sc_po_check): Tests should always output English. Their output is for
developers, not users
(sc_prohibit_magic_number_exit): tests/test-plugin.c has a parsing
issue that has been reported to gnulib. Others should be checked.
(sc_trailing_blank): Fixed the relevant files instead of ignoring them
(sc_two_space_separator_in_usage): Doesn't seem to trigger on removal
(sc_prohibit_empty_lines_at_EOF): Same
(sc_prohibit_sprintf): Same
(sc_prohibit_printf): Re-arrange within file
(sc_prohibit_free): Same
(sc_prohibit_alloc): Same
(sc_gettext_printf): Same
* docs/DoxygenLayout.xml: Remove trailing whitespaces
* docs/libwget.doxy.in: Same
* tests/libtest.c: Don't internationalize test suite strings
* tests/test-*.c: Use EXIT_FAILURE and EXIT_SUCCESS instead of 1 and 0
* README.md: Mention zstandard
* configure.ac: Check for libzstd
* docs/wget2.md: Document new --compression type
* include/wget/wget.h: Add wget_content_encoding_zstd
* libwget/decompressor.c: Implement the zstd decompressor
* libwget/http_parse.c (wget_http_parse_content_encoding): Add zstd
* src/options.c (print_version): Add +/-zstd for --version,
(parse_compression): Check for wget_content_encoding_zstd,
(options): Add zstd to help text
* src/wget.c (http_create_request): Add zstd to Accept-Encoding:
* tests/test-compression.c: Add test for zstd
